155513012 has 6 divisors (see below), whose sum is σ = 272147778. Its totient is φ = 77756504.

The previous prime is 155513003. The next prime is 155513021. The reversal of 155513012 is 210315551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (155513003) and next prime (155513021).

It can be written as a sum of positive squares in only one way, i.e., 153859216 + 1653796 = 12404^2 + 1286^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19439123 + ... + 19439130.

It is an arithmetic number, because the mean of its divisors is an integer number (45357963).

Almost surely, 2^155513012 is an apocalyptic number.

It is an amenable number.

155513012 is a deficient number, since it is larger than the sum of its proper divisors (116634766).

155513012 is a wasteful number, since it uses less digits than its factorization.

155513012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38878257 (or 38878255 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 155513012 is about 12470.4856360929. The cubic root of 155513012 is about 537.7605149250.

Adding to 155513012 its reverse (210315551), we get a palindrome (365828563).

The spelling of 155513012 in words is "one hundred fifty-five million, five hundred thirteen thousand, twelve".