151621551 has 12 divisors (see below), whose sum is σ = 227120712. Its totient is φ = 101080872.

The previous prime is 151621549. The next prime is 151621553. The reversal of 151621551 is 155126151.

151621551 is a `hidden beast` number, since 1 + 51 + 62 + 1 + 551 = 666.

It is an interprime number because it is at equal distance from previous prime (151621549) and next prime (151621553).

It is not a de Polignac number, because 151621551 - 2¹ = 151621549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151621553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 311736 + ... + 312221.

It is an arithmetic number, because the mean of its divisors is an integer number (18926726).

Almost surely, 2^151621551 is an apocalyptic number.

151621551 is a deficient number, since it is larger than the sum of its proper divisors (75499161).

151621551 is an frugal number, since it uses more digits than its factorization.

151621551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623972 (or 623960 counting only the distinct ones).

The product of its digits is 1500, while the sum is 27.

The square root of 151621551 is about 12313.4703069443. The cubic root of 151621551 is about 533.2370432501.

The spelling of 151621551 in words is "one hundred fifty-one million, six hundred twenty-one thousand, five hundred fifty-one".