137897551 has 4 divisors (see below), whose sum is σ = 150433704. Its totient is φ = 125361400.

The previous prime is 137897531. The next prime is 137897561. The reversal of 137897551 is 155798731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155798731 = 11 ⋅14163521.

It is a cyclic number.

It is not a de Polignac number, because 137897551 - 2⁵ = 137897519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137897521) 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, 6268060 + ... + 6268081.

It is an arithmetic number, because the mean of its divisors is an integer number (37608426).

Almost surely, 2^137897551 is an apocalyptic number.

137897551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

137897551 is a deficient number, since it is larger than the sum of its proper divisors (12536153).

137897551 is a wasteful number, since it uses less digits than its factorization.

137897551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12536152.

The product of its digits is 264600, while the sum is 46.

The square root of 137897551 is about 11742.9787958593. The cubic root of 137897551 is about 516.6370142307.

The spelling of 137897551 in words is "one hundred thirty-seven million, eight hundred ninety-seven thousand, five hundred fifty-one".