61215154 has 32 divisors (see below), whose sum is σ = 123290496. Its totient is φ = 22014720.

The previous prime is 61215149. The next prime is 61215157. The reversal of 61215154 is 45151216.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (61215157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13287 + ... + 17290.

It is an arithmetic number, because the mean of its divisors is an integer number (3852828).

Almost surely, 2^61215154 is an apocalyptic number.

61215154 is an abundant number, since it is smaller than the sum of its proper divisors (62075342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61215154 is a wasteful number, since it uses less digits than its factorization.

61215154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30610.

The product of its digits is 1200, while the sum is 25.

The square root of 61215154 is about 7824.0113752474. The cubic root of 61215154 is about 394.1119911488. Note that the first 3 decimals are identical.

The spelling of 61215154 in words is "sixty-one million, two hundred fifteen thousand, one hundred fifty-four".