36991457 has 4 divisors (see below), whose sum is σ = 37076160. Its totient is φ = 36906756.

The previous prime is 36991433. The next prime is 36991459. The reversal of 36991457 is 75419963.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75419963 = 71 ⋅1062253.

It is a cyclic number.

It is not a de Polignac number, because 36991457 - 2⁶ = 36991393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36991459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41693 + ... + 42570.

It is an arithmetic number, because the mean of its divisors is an integer number (9269040).

Almost surely, 2^36991457 is an apocalyptic number.

It is an amenable number.

36991457 is a deficient number, since it is larger than the sum of its proper divisors (84703).

36991457 is an equidigital number, since it uses as much as digits as its factorization.

36991457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84702.

The product of its digits is 204120, while the sum is 44.

The square root of 36991457 is about 6082.0602594844. The cubic root of 36991457 is about 333.1965370903.

The spelling of 36991457 in words is "thirty-six million, nine hundred ninety-one thousand, four hundred fifty-seven".