61769531 has 4 divisors (see below), whose sum is σ = 61790832. Its totient is φ = 61748232.

The previous prime is 61769527. The next prime is 61769549. The reversal of 61769531 is 13596716.

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

It is a cyclic number.

It is not a de Polignac number, because 61769531 - 2² = 61769527 is a prime.

It is a super-2 number, since 2×61769531² = 7630949919919922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61769501) 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, 5456 + ... + 12381.

It is an arithmetic number, because the mean of its divisors is an integer number (15447708).

Almost surely, 2^61769531 is an apocalyptic number.

61769531 is a deficient number, since it is larger than the sum of its proper divisors (21301).

61769531 is a wasteful number, since it uses less digits than its factorization.

61769531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21300.

The product of its digits is 34020, while the sum is 38.

The square root of 61769531 is about 7859.3594522709. The cubic root of 61769531 is about 395.2981373577.

The spelling of 61769531 in words is "sixty-one million, seven hundred sixty-nine thousand, five hundred thirty-one".