61531474 has 4 divisors (see below), whose sum is σ = 92297214. Its totient is φ = 30765736.

The previous prime is 61531471. The next prime is 61531499. The reversal of 61531474 is 47413516.

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

It can be written as a sum of positive squares in only one way, i.e., 39375625 + 22155849 = 6275^2 + 4707^2 .

It is a super-2 number, since 2×61531474² = 7572244585225352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61531471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15382867 + ... + 15382870.

Almost surely, 2^61531474 is an apocalyptic number.

61531474 is a deficient number, since it is larger than the sum of its proper divisors (30765740).

61531474 is a wasteful number, since it uses less digits than its factorization.

61531474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30765739.

The product of its digits is 10080, while the sum is 31.

The square root of 61531474 is about 7844.2000229469. The cubic root of 61531474 is about 394.7896631587.

The spelling of 61531474 in words is "sixty-one million, five hundred thirty-one thousand, four hundred seventy-four".