31451101649 has 4 divisors (see below), whose sum is σ = 34310292720. Its totient is φ = 28591910580.

The previous prime is 31451101639. The next prime is 31451101687. The reversal of 31451101649 is 94610115413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31451101649 is a prime.

It is a super-3 number, since 3×31451101649³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (31451101639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1429595519 + ... + 1429595540.

It is an arithmetic number, because the mean of its divisors is an integer number (8577573180).

Almost surely, 2^31451101649 is an apocalyptic number.

It is an amenable number.

31451101649 is a deficient number, since it is larger than the sum of its proper divisors (2859191071).

31451101649 is a wasteful number, since it uses less digits than its factorization.

31451101649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2859191070.

The product of its (nonzero) digits is 12960, while the sum is 35.

The spelling of 31451101649 in words is "thirty-one billion, four hundred fifty-one million, one hundred one thousand, six hundred forty-nine".