61577137 has 4 divisors (see below), whose sum is σ = 61645936. Its totient is φ = 61508340.

The previous prime is 61577123. The next prime is 61577143. The reversal of 61577137 is 73177516.

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 a de Polignac number, because none of the positive numbers 2^k-61577137 is a prime.

It is a super-2 number, since 2×61577137² = 7583487602233538, 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 = 61577096 and 61577105.

It is not an unprimeable number, because it can be changed into a prime (61577107) 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, 33039 + ... + 34852.

It is an arithmetic number, because the mean of its divisors is an integer number (15411484).

Almost surely, 2^61577137 is an apocalyptic number.

It is an amenable number.

61577137 is a deficient number, since it is larger than the sum of its proper divisors (68799).

61577137 is an equidigital number, since it uses as much as digits as its factorization.

61577137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68798.

The product of its digits is 30870, while the sum is 37.

The square root of 61577137 is about 7847.1101050004. The cubic root of 61577137 is about 394.8872978686.

The spelling of 61577137 in words is "sixty-one million, five hundred seventy-seven thousand, one hundred thirty-seven".