19941931 has 2 divisors, whose sum is σ = 19941932. Its totient is φ = 19941930.

The previous prime is 19941923. The next prime is 19941953. The reversal of 19941931 is 13914991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19941931 - 2³ = 19941923 is a prime.

It is a super-2 number, since 2×19941931² = 795361224017522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19941991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9970965 + 9970966.

It is an arithmetic number, because the mean of its divisors is an integer number (9970966).

Almost surely, 2^19941931 is an apocalyptic number.

19941931 is a deficient number, since it is larger than the sum of its proper divisors (1).

19941931 is an equidigital number, since it uses as much as digits as its factorization.

19941931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 37.

The square root of 19941931 is about 4465.6389240511. The cubic root of 19941931 is about 271.1788011365.

The spelling of 19941931 in words is "nineteen million, nine hundred forty-one thousand, nine hundred thirty-one".