61478251 has 4 divisors (see below), whose sum is σ = 62638272. Its totient is φ = 60318232.

The previous prime is 61478227. The next prime is 61478257. The reversal of 61478251 is 15287416.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61478251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61478257) 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, 579931 + ... + 580036.

It is an arithmetic number, because the mean of its divisors is an integer number (15659568).

Almost surely, 2^61478251 is an apocalyptic number.

61478251 is a deficient number, since it is larger than the sum of its proper divisors (1160021).

61478251 is a wasteful number, since it uses less digits than its factorization.

61478251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160020.

The product of its digits is 13440, while the sum is 34.

The square root of 61478251 is about 7840.8067824682. The cubic root of 61478251 is about 394.6758029935.

The spelling of 61478251 in words is "sixty-one million, four hundred seventy-eight thousand, two hundred fifty-one".