61691523 has 16 divisors (see below), whose sum is σ = 85072896. Its totient is φ = 39742560.

The previous prime is 61691491. The next prime is 61691527. The reversal of 61691523 is 32519616.

It is a happy number.

It is not a de Polignac number, because 61691523 - 2⁵ = 61691491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61691527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7758 + ... + 13548.

It is an arithmetic number, because the mean of its divisors is an integer number (5317056).

Almost surely, 2^61691523 is an apocalyptic number.

61691523 is a deficient number, since it is larger than the sum of its proper divisors (23381373).

61691523 is a wasteful number, since it uses less digits than its factorization.

61691523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5914.

The product of its digits is 9720, while the sum is 33.

The square root of 61691523 is about 7854.3951390288. The cubic root of 61691523 is about 395.1316614988.

The spelling of 61691523 in words is "sixty-one million, six hundred ninety-one thousand, five hundred twenty-three".