61431693 has 16 divisors (see below), whose sum is σ = 91293120. Its totient is φ = 36516096.

The previous prime is 61431691. The next prime is 61431701. The reversal of 61431693 is 39613416.

It is not a de Polignac number, because 61431693 - 2¹ = 61431691 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61431691) 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, 30730 + ... + 32667.

It is an arithmetic number, because the mean of its divisors is an integer number (5705820).

Almost surely, 2^61431693 is an apocalyptic number.

It is an amenable number.

61431693 is a deficient number, since it is larger than the sum of its proper divisors (29861427).

61431693 is a wasteful number, since it uses less digits than its factorization.

61431693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63436.

The product of its digits is 11664, while the sum is 33.

The square root of 61431693 is about 7837.8372654706. The cubic root of 61431693 is about 394.5761473902.

The spelling of 61431693 in words is "sixty-one million, four hundred thirty-one thousand, six hundred ninety-three".