261493031 has 8 divisors (see below), whose sum is σ = 281415024. Its totient is φ = 242075520.

The previous prime is 261493021. The next prime is 261493061. The reversal of 261493031 is 130394162.

261493031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261493031 is a prime.

It is a super-2 number, since 2×261493031² = 136757210523133922, 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 = 261492985 and 261493003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261493021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125045 + ... + 127118.

It is an arithmetic number, because the mean of its divisors is an integer number (35176878).

Almost surely, 2^261493031 is an apocalyptic number.

261493031 is a deficient number, since it is larger than the sum of its proper divisors (19921993).

261493031 is a wasteful number, since it uses less digits than its factorization.

261493031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252241.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 261493031 is about 16170.7461485239. The cubic root of 261493031 is about 639.4698009569.

The spelling of 261493031 in words is "two hundred sixty-one million, four hundred ninety-three thousand, thirty-one".