61457551 has 4 divisors (see below), whose sum is σ = 62091232. Its totient is φ = 60823872.

The previous prime is 61457549. The next prime is 61457563. The reversal of 61457551 is 15575416.

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

It is a cyclic number.

It is not a de Polignac number, because 61457551 - 2¹ = 61457549 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 (61457251) 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, 316695 + ... + 316888.

It is an arithmetic number, because the mean of its divisors is an integer number (15522808).

Almost surely, 2^61457551 is an apocalyptic number.

61457551 is a deficient number, since it is larger than the sum of its proper divisors (633681).

61457551 is an equidigital number, since it uses as much as digits as its factorization.

61457551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633680.

The product of its digits is 21000, while the sum is 34.

The square root of 61457551 is about 7839.4866541120. The cubic root of 61457551 is about 394.6315016561.

The spelling of 61457551 in words is "sixty-one million, four hundred fifty-seven thousand, five hundred fifty-one".