61770531 has 4 divisors (see below), whose sum is σ = 82360712. Its totient is φ = 41180352.

The previous prime is 61770529. The next prime is 61770587. The reversal of 61770531 is 13507716.

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

It is not a de Polignac number, because 61770531 - 2¹ = 61770529 is a prime.

It is a super-2 number, since 2×61770531² = 7631197000043922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61770431) 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, 10295086 + ... + 10295091.

It is an arithmetic number, because the mean of its divisors is an integer number (20590178).

Almost surely, 2^61770531 is an apocalyptic number.

61770531 is a deficient number, since it is larger than the sum of its proper divisors (20590181).

61770531 is a wasteful number, since it uses less digits than its factorization.

61770531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20590180.

The product of its (nonzero) digits is 4410, while the sum is 30.

The square root of 61770531 is about 7859.4230704295. The cubic root of 61770531 is about 395.3002705346.

The spelling of 61770531 in words is "sixty-one million, seven hundred seventy thousand, five hundred thirty-one".