61100031 has 4 divisors (see below), whose sum is σ = 81466712. Its totient is φ = 40733352.

The previous prime is 61100027. The next prime is 61100063. The reversal of 61100031 is 13000116.

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

It is not a de Polignac number, because 61100031 - 2² = 61100027 is a prime.

It is a super-2 number, since 2×61100031² = 7466427576401922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61100231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10183336 + ... + 10183341.

It is an arithmetic number, because the mean of its divisors is an integer number (20366678).

Almost surely, 2^61100031 is an apocalyptic number.

61100031 is a deficient number, since it is larger than the sum of its proper divisors (20366681).

61100031 is a wasteful number, since it uses less digits than its factorization.

61100031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20366680.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 61100031 is about 7816.6508812918. The cubic root of 61100031 is about 393.8647766179.

Adding to 61100031 its reverse (13000116), we get a palindrome (74100147).

The spelling of 61100031 in words is "sixty-one million, one hundred thousand, thirty-one".