61381531732 has 12 divisors (see below), whose sum is σ = 107446667860. Its totient is φ = 30682483776.

The previous prime is 61381531721. The next prime is 61381531733. The reversal of 61381531732 is 23713518316.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8745242256 + 52636289476 = 93516^2 + 229426^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61381531733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2053833 + ... + 2083504.

Almost surely, 2^61381531732 is an apocalyptic number.

It is an amenable number.

61381531732 is a deficient number, since it is larger than the sum of its proper divisors (46065136128).

61381531732 is a wasteful number, since it uses less digits than its factorization.

61381531732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4141050 (or 4141048 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The spelling of 61381531732 in words is "sixty-one billion, three hundred eighty-one million, five hundred thirty-one thousand, seven hundred thirty-two".