61891051 has 4 divisors (see below), whose sum is σ = 61953400. Its totient is φ = 61828704.

The previous prime is 61891031. The next prime is 61891103. The reversal of 61891051 is 15019816.

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 61891051 - 2⁵ = 61891019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61891031) 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, 29661 + ... + 31678.

It is an arithmetic number, because the mean of its divisors is an integer number (15488350).

Almost surely, 2^61891051 is an apocalyptic number.

61891051 is a deficient number, since it is larger than the sum of its proper divisors (62349).

61891051 is a wasteful number, since it uses less digits than its factorization.

61891051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62348.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 61891051 is about 7867.0865636524. The cubic root of 61891051 is about 395.5571926030.

The spelling of 61891051 in words is "sixty-one million, eight hundred ninety-one thousand, fifty-one".