155401615 has 4 divisors (see below), whose sum is σ = 186481944. Its totient is φ = 124321288.

The previous prime is 155401579. The next prime is 155401621. The reversal of 155401615 is 516104551.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 155401615 - 2²³ = 147013007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15540157 + ... + 15540166.

It is an arithmetic number, because the mean of its divisors is an integer number (46620486).

Almost surely, 2^155401615 is an apocalyptic number.

155401615 is a deficient number, since it is larger than the sum of its proper divisors (31080329).

155401615 is an equidigital number, since it uses as much as digits as its factorization.

155401615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31080328.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 155401615 is about 12466.0184100618. The cubic root of 155401615 is about 537.6320814760.

The spelling of 155401615 in words is "one hundred fifty-five million, four hundred one thousand, six hundred fifteen".