137993477 has 2 divisors, whose sum is σ = 137993478. Its totient is φ = 137993476.

The previous prime is 137993473. The next prime is 137993483. The reversal of 137993477 is 774399731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128346241 + 9647236 = 11329^2 + 3106^2 .

It is a cyclic number.

It is not a de Polignac number, because 137993477 - 2² = 137993473 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137993473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68996738 + 68996739.

It is an arithmetic number, because the mean of its divisors is an integer number (68996739).

Almost surely, 2^137993477 is an apocalyptic number.

It is an amenable number.

137993477 is a deficient number, since it is larger than the sum of its proper divisors (1).

137993477 is an equidigital number, since it uses as much as digits as its factorization.

137993477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1000188, while the sum is 50.

The square root of 137993477 is about 11747.0624838723. The cubic root of 137993477 is about 516.7567829399.

The spelling of 137993477 in words is "one hundred thirty-seven million, nine hundred ninety-three thousand, four hundred seventy-seven".