261012031 has 4 divisors (see below), whose sum is σ = 298299472. Its totient is φ = 223724592.

The previous prime is 261012019. The next prime is 261012043. The reversal of 261012031 is 130210162.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (261012019) and next prime (261012043).

It is not a de Polignac number, because 261012031 - 2⁷ = 261011903 is a prime.

It is a super-2 number, since 2×261012031² = 136254560653489922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261011996 and 261012014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261012131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18643710 + ... + 18643723.

It is an arithmetic number, because the mean of its divisors is an integer number (74574868).

Almost surely, 2^261012031 is an apocalyptic number.

261012031 is a deficient number, since it is larger than the sum of its proper divisors (37287441).

261012031 is an equidigital number, since it uses as much as digits as its factorization.

261012031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37287440.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 261012031 is about 16155.8667672149. The cubic root of 261012031 is about 639.0774721309.

Adding to 261012031 its reverse (130210162), we get a palindrome (391222193).

It can be divided in two parts, 2610 and 12031, that added together give a palindrome (14641).

The spelling of 261012031 in words is "two hundred sixty-one million, twelve thousand, thirty-one".