61156421 has 8 divisors (see below), whose sum is σ = 64456800. Its totient is φ = 57864240.

The previous prime is 61156411. The next prime is 61156427. The reversal of 61156421 is 12465116.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61156421 - 2²² = 56962117 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 (61156427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18806 + ... + 21816.

It is an arithmetic number, because the mean of its divisors is an integer number (8057100).

Almost surely, 2^61156421 is an apocalyptic number.

It is an amenable number.

61156421 is a deficient number, since it is larger than the sum of its proper divisors (3300379).

61156421 is a wasteful number, since it uses less digits than its factorization.

61156421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4099.

The product of its digits is 1440, while the sum is 26.

The square root of 61156421 is about 7820.2570929606. The cubic root of 61156421 is about 393.9859069744.

The spelling of 61156421 in words is "sixty-one million, one hundred fifty-six thousand, four hundred twenty-one".