137463721 has 2 divisors, whose sum is σ = 137463722. Its totient is φ = 137463720.

The previous prime is 137463661. The next prime is 137463737. The reversal of 137463721 is 127364731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129140496 + 8323225 = 11364^2 + 2885^2 .

It is a cyclic number.

It is not a de Polignac number, because 137463721 - 2⁷ = 137463593 is a prime.

It is not a weakly prime, because it can be changed into another prime (137463761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68731860 + 68731861.

It is an arithmetic number, because the mean of its divisors is an integer number (68731861).

Almost surely, 2^137463721 is an apocalyptic number.

It is an amenable number.

137463721 is a deficient number, since it is larger than the sum of its proper divisors (1).

137463721 is an equidigital number, since it uses as much as digits as its factorization.

137463721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 34.

The square root of 137463721 is about 11724.4923557483. The cubic root of 137463721 is about 516.0946596864.

The spelling of 137463721 in words is "one hundred thirty-seven million, four hundred sixty-three thousand, seven hundred twenty-one".