31620691749 has 16 divisors (see below), whose sum is σ = 43928539200. Its totient is φ = 20207112576.

The previous prime is 31620691723. The next prime is 31620691763. The reversal of 31620691749 is 94719602613.

It is not a de Polignac number, because 31620691749 - 2¹² = 31620687653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31620691698 and 31620691707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31620691769) 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, 1295304 + ... + 1319489.

It is an arithmetic number, because the mean of its divisors is an integer number (2745533700).

Almost surely, 2^31620691749 is an apocalyptic number.

It is an amenable number.

31620691749 is a deficient number, since it is larger than the sum of its proper divisors (12307847451).

31620691749 is a wasteful number, since it uses less digits than its factorization.

31620691749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614964.

The product of its (nonzero) digits is 489888, while the sum is 48.

The spelling of 31620691749 in words is "thirty-one billion, six hundred twenty million, six hundred ninety-one thousand, seven hundred forty-nine".