91000000037 has 2 divisors, whose sum is σ = 91000000038. Its totient is φ = 91000000036.

The previous prime is 90999999973. The next prime is 91000000093. The reversal of 91000000037 is 73000000019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71379274561 + 19620725476 = 267169^2 + 140074^2 .

It is an emirp because it is prime and its reverse (73000000019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91000000037 - 2⁶ = 90999999973 is a prime.

It is a super-4 number, since 4×91000000037⁴ (a number of 45 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90999999955 and 91000000018.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91000000337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500000018 + 45500000019.

It is an arithmetic number, because the mean of its divisors is an integer number (45500000019).

Almost surely, 2^91000000037 is an apocalyptic number.

It is an amenable number.

91000000037 is a deficient number, since it is larger than the sum of its proper divisors (1).

91000000037 is an equidigital number, since it uses as much as digits as its factorization.

91000000037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189, while the sum is 20.

The spelling of 91000000037 in words is "ninety-one billion, thirty-seven", and thus it is an aban number and an uban number.