61156251 has 12 divisors (see below), whose sum is σ = 95132128. Its totient is φ = 37634544.

The previous prime is 61156237. The next prime is 61156253. The reversal of 61156251 is 15265116.

It is a happy number.

It is not a de Polignac number, because 61156251 - 2⁵ = 61156219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61156253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261235 + ... + 261468.

Almost surely, 2^61156251 is an apocalyptic number.

61156251 is a deficient number, since it is larger than the sum of its proper divisors (33975877).

61156251 is a wasteful number, since it uses less digits than its factorization.

61156251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522722 (or 522719 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 61156251 is about 7820.2462237451. The cubic root of 61156251 is about 393.9855419124.

The spelling of 61156251 in words is "sixty-one million, one hundred fifty-six thousand, two hundred fifty-one".