61687297 has 4 divisors (see below), whose sum is σ = 70499776. Its totient is φ = 52874820.

The previous prime is 61687291. The next prime is 61687313. The reversal of 61687297 is 79278616.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61687297 - 2³ = 61687289 is a prime.

It is a super-2 number, since 2×61687297² = 7610645222332418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61687291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4406229 + ... + 4406242.

It is an arithmetic number, because the mean of its divisors is an integer number (17624944).

Almost surely, 2^61687297 is an apocalyptic number.

It is an amenable number.

61687297 is a deficient number, since it is larger than the sum of its proper divisors (8812479).

61687297 is an equidigital number, since it uses as much as digits as its factorization.

61687297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8812478.

The product of its digits is 254016, while the sum is 46.

The square root of 61687297 is about 7854.1261130695. The cubic root of 61687297 is about 395.1226388408.

The spelling of 61687297 in words is "sixty-one million, six hundred eighty-seven thousand, two hundred ninety-seven".