137464721 has 4 divisors (see below), whose sum is σ = 143441472. Its totient is φ = 131487972.

The previous prime is 137464711. The next prime is 137464729. The reversal of 137464721 is 127464731.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137464721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (137464729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2988341 + ... + 2988386.

It is an arithmetic number, because the mean of its divisors is an integer number (35860368).

Almost surely, 2^137464721 is an apocalyptic number.

It is an amenable number.

137464721 is a deficient number, since it is larger than the sum of its proper divisors (5976751).

137464721 is an equidigital number, since it uses as much as digits as its factorization.

137464721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5976750.

The product of its digits is 28224, while the sum is 35.

The square root of 137464721 is about 11724.5350014404. The cubic root of 137464721 is about 516.0959111521.

The spelling of 137464721 in words is "one hundred thirty-seven million, four hundred sixty-four thousand, seven hundred twenty-one".