61556151 has 4 divisors (see below), whose sum is σ = 82074872. Its totient is φ = 41037432.

The previous prime is 61556113. The next prime is 61556153. The reversal of 61556151 is 15165516.

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

It is not a de Polignac number, because 61556151 - 2⁶ = 61556087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61556153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10259356 + ... + 10259361.

It is an arithmetic number, because the mean of its divisors is an integer number (20518718).

Almost surely, 2^61556151 is an apocalyptic number.

61556151 is a deficient number, since it is larger than the sum of its proper divisors (20518721).

61556151 is a wasteful number, since it uses less digits than its factorization.

61556151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20518720.

The product of its digits is 4500, while the sum is 30.

The square root of 61556151 is about 7845.7728108836. The cubic root of 61556151 is about 394.8424324805.

The spelling of 61556151 in words is "sixty-one million, five hundred fifty-six thousand, one hundred fifty-one".