155145974 has 4 divisors (see below), whose sum is σ = 232718964. Its totient is φ = 77572986.

The previous prime is 155145973. The next prime is 155145983. The reversal of 155145974 is 479541551.

It is a happy number.

155145974 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 479541551 = 19 ⋅25239029.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155145973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38786492 + ... + 38786495.

It is an arithmetic number, because the mean of its divisors is an integer number (58179741).

Almost surely, 2^155145974 is an apocalyptic number.

155145974 is a deficient number, since it is larger than the sum of its proper divisors (77572990).

155145974 is an equidigital number, since it uses as much as digits as its factorization.

155145974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77572989.

The product of its digits is 126000, while the sum is 41.

The square root of 155145974 is about 12455.7606752860. The cubic root of 155145974 is about 537.3371119185.

The spelling of 155145974 in words is "one hundred fifty-five million, one hundred forty-five thousand, nine hundred seventy-four".