137978671 has 2 divisors, whose sum is σ = 137978672. Its totient is φ = 137978670.

The previous prime is 137978657. The next prime is 137978677. The reversal of 137978671 is 176879731.

137978671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 137978671 - 2⁷ = 137978543 is a prime.

It is a super-2 number, since 2×137978671² = 38076227301852482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137978677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68989335 + 68989336.

It is an arithmetic number, because the mean of its divisors is an integer number (68989336).

Almost surely, 2^137978671 is an apocalyptic number.

137978671 is a deficient number, since it is larger than the sum of its proper divisors (1).

137978671 is an equidigital number, since it uses as much as digits as its factorization.

137978671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 49.

The square root of 137978671 is about 11746.4322668630. The cubic root of 137978671 is about 516.7383004852.

The spelling of 137978671 in words is "one hundred thirty-seven million, nine hundred seventy-eight thousand, six hundred seventy-one".