61531790 has 16 divisors (see below), whose sum is σ = 110966112. Its totient is φ = 24566304.

The previous prime is 61531759. The next prime is 61531793. The reversal of 61531790 is 9713516.

It is a super-2 number, since 2×61531790² = 7572322361208200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61531793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47 + ... + 11093.

It is an arithmetic number, because the mean of its divisors is an integer number (6935382).

Almost surely, 2^61531790 is an apocalyptic number.

61531790 is a deficient number, since it is larger than the sum of its proper divisors (49434322).

61531790 is a wasteful number, since it uses less digits than its factorization.

61531790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11611.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 61531790 is about 7844.2201651917. The cubic root of 61531790 is about 394.7903389826.

The spelling of 61531790 in words is "sixty-one million, five hundred thirty-one thousand, seven hundred ninety".