19071640631 has 2 divisors, whose sum is σ = 19071640632. Its totient is φ = 19071640630.

The previous prime is 19071640619. The next prime is 19071640657. The reversal of 19071640631 is 13604617091.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19071640631 - 2¹⁰ = 19071639607 is a prime.

It is a super-2 number, since 2×19071640631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19071640031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9535820315 + 9535820316.

It is an arithmetic number, because the mean of its divisors is an integer number (9535820316).

Almost surely, 2^19071640631 is an apocalyptic number.

19071640631 is a deficient number, since it is larger than the sum of its proper divisors (1).

19071640631 is an equidigital number, since it uses as much as digits as its factorization.

19071640631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The spelling of 19071640631 in words is "nineteen billion, seventy-one million, six hundred forty thousand, six hundred thirty-one".