61631617 has 4 divisors (see below), whose sum is σ = 62942976. Its totient is φ = 60320260.

The previous prime is 61631597. The next prime is 61631629. The reversal of 61631617 is 71613616.

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-61631617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61631417) 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, 655609 + ... + 655702.

It is an arithmetic number, because the mean of its divisors is an integer number (15735744).

Almost surely, 2^61631617 is an apocalyptic number.

It is an amenable number.

61631617 is a deficient number, since it is larger than the sum of its proper divisors (1311359).

61631617 is a wasteful number, since it uses less digits than its factorization.

61631617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311358.

The product of its digits is 4536, while the sum is 31.

The square root of 61631617 is about 7850.5806791600. The cubic root of 61631617 is about 395.0037215907.

The spelling of 61631617 in words is "sixty-one million, six hundred thirty-one thousand, six hundred seventeen".