101638540831 has 2 divisors, whose sum is σ = 101638540832. Its totient is φ = 101638540830.

The previous prime is 101638540819. The next prime is 101638540889. The reversal of 101638540831 is 138045836101.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101638540831 - 2⁵ = 101638540799 is a prime.

It is a super-2 number, since 2×101638540831² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101638540811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50819270415 + 50819270416.

It is an arithmetic number, because the mean of its divisors is an integer number (50819270416).

Almost surely, 2^101638540831 is an apocalyptic number.

101638540831 is a deficient number, since it is larger than the sum of its proper divisors (1).

101638540831 is an equidigital number, since it uses as much as digits as its factorization.

101638540831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 101638540831 in words is "one hundred one billion, six hundred thirty-eight million, five hundred forty thousand, eight hundred thirty-one".