90931272237 has 24 divisors (see below), whose sum is σ = 141460237464. Its totient is φ = 55953120384.

The previous prime is 90931272217. The next prime is 90931272253. The reversal of 90931272237 is 73227213909.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1006856361 + 89924415876 = 31731^2 + 299874^2 .

It is not a de Polignac number, because 90931272237 - 2⁷ = 90931272109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90931272192 and 90931272201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90931272217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1901383 + ... + 1948619.

It is an arithmetic number, because the mean of its divisors is an integer number (5894176561).

Almost surely, 2^90931272237 is an apocalyptic number.

It is an amenable number.

90931272237 is a deficient number, since it is larger than the sum of its proper divisors (50528965227).

90931272237 is a wasteful number, since it uses less digits than its factorization.

90931272237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63709 (or 63706 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The spelling of 90931272237 in words is "ninety billion, nine hundred thirty-one million, two hundred seventy-two thousand, two hundred thirty-seven".