120991537 has 4 divisors (see below), whose sum is σ = 121014000. Its totient is φ = 120969076.

The previous prime is 120991513. The next prime is 120991547. The reversal of 120991537 is 735199021.

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: 735199021 = 5483 ⋅134087.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120991537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120991496 and 120991505.

It is not an unprimeable number, because it can be changed into a prime (120991547) 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, 2214 + ... + 15712.

It is an arithmetic number, because the mean of its divisors is an integer number (30253500).

Almost surely, 2^120991537 is an apocalyptic number.

It is an amenable number.

120991537 is a deficient number, since it is larger than the sum of its proper divisors (22463).

120991537 is an equidigital number, since it uses as much as digits as its factorization.

120991537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22462.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 120991537 is about 10999.6153114552. The cubic root of 120991537 is about 494.5972127232.

The spelling of 120991537 in words is "one hundred twenty million, nine hundred ninety-one thousand, five hundred thirty-seven".