155451551 has 4 divisors (see below), whose sum is σ = 156495000. Its totient is φ = 154408104.

The previous prime is 155451547. The next prime is 155451563. The reversal of 155451551 is 155154551.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 155451551 - 2² = 155451547 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 (155451511) 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, 521501 + ... + 521798.

It is an arithmetic number, because the mean of its divisors is an integer number (39123750).

Almost surely, 2^155451551 is an apocalyptic number.

155451551 is a deficient number, since it is larger than the sum of its proper divisors (1043449).

155451551 is a wasteful number, since it uses less digits than its factorization.

155451551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043448.

The product of its digits is 12500, while the sum is 32.

The square root of 155451551 is about 12468.0211340854. The cubic root of 155451551 is about 537.6896620026.

The spelling of 155451551 in words is "one hundred fifty-five million, four hundred fifty-one thousand, five hundred fifty-one".