61512156 has 48 divisors (see below), whose sum is σ = 162107680. Its totient is φ = 20165760.

The previous prime is 61512151. The next prime is 61512163. The reversal of 61512156 is 65121516.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61512151) 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, 1920 + ... + 11256.

Almost surely, 2^61512156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61512156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81053840).

61512156 is an abundant number, since it is smaller than the sum of its proper divisors (100595524).

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

61512156 is a wasteful number, since it uses less digits than its factorization.

61512156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9411 (or 9403 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 61512156 is about 7842.9685706370. The cubic root of 61512156 is about 394.7483436817.

The spelling of 61512156 in words is "sixty-one million, five hundred twelve thousand, one hundred fifty-six".