137128051 has 4 divisors (see below), whose sum is σ = 139059504. Its totient is φ = 135196600.

The previous prime is 137128021. The next prime is 137128129. The reversal of 137128051 is 150821731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137128051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137128021) 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, 965620 + ... + 965761.

It is an arithmetic number, because the mean of its divisors is an integer number (34764876).

Almost surely, 2^137128051 is an apocalyptic number.

137128051 is a deficient number, since it is larger than the sum of its proper divisors (1931453).

137128051 is an equidigital number, since it uses as much as digits as its factorization.

137128051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931452.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 137128051 is about 11710.1687007489. The cubic root of 137128051 is about 515.6742367724.

Adding to 137128051 its reverse (150821731), we get a palindrome (287949782).

The spelling of 137128051 in words is "one hundred thirty-seven million, one hundred twenty-eight thousand, fifty-one".