61021057 has 4 divisors (see below), whose sum is σ = 61128496. Its totient is φ = 60913620.

The previous prime is 61021049. The next prime is 61021099. The reversal of 61021057 is 75012016.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61021057 - 2³ = 61021049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61021157) 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, 52863 + ... + 54004.

It is an arithmetic number, because the mean of its divisors is an integer number (15282124).

Almost surely, 2^61021057 is an apocalyptic number.

It is an amenable number.

61021057 is a deficient number, since it is larger than the sum of its proper divisors (107439).

61021057 is a wasteful number, since it uses less digits than its factorization.

61021057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107438.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 61021057 is about 7811.5975958827. The cubic root of 61021057 is about 393.6950086300.

It can be divided in two parts, 610210 and 57, that multiplied together give a triangular number (34781970 = T₈₃₄₀).

The spelling of 61021057 in words is "sixty-one million, twenty-one thousand, fifty-seven".