870135551 has 4 divisors (see below), whose sum is σ = 870217704. Its totient is φ = 870053400.

The previous prime is 870135529. The next prime is 870135557. The reversal of 870135551 is 155531078.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 155531078 = 2 ⋅77765539.

It is a cyclic number.

It is not a de Polignac number, because 870135551 - 2¹⁴ = 870119167 is a prime.

It is a super-2 number, since 2×870135551² = 1514271754228147202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870135557) 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, 22340 + ... + 47321.

It is an arithmetic number, because the mean of its divisors is an integer number (217554426).

Almost surely, 2^870135551 is an apocalyptic number.

870135551 is a deficient number, since it is larger than the sum of its proper divisors (82153).

870135551 is a wasteful number, since it uses less digits than its factorization.

870135551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82152.

The product of its (nonzero) digits is 21000, while the sum is 35.

The square root of 870135551 is about 29498.0601226589. The cubic root of 870135551 is about 954.6898478415.

The spelling of 870135551 in words is "eight hundred seventy million, one hundred thirty-five thousand, five hundred fifty-one".