61021619 has 8 divisors (see below), whose sum is σ = 64707408. Its totient is φ = 57346560.

The previous prime is 61021613. The next prime is 61021627. The reversal of 61021619 is 91612016.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61021619 is a prime.

It is a super-2 number, since 2×61021619² = 7447275970762322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61021613) 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, 11099 + ... + 15659.

It is an arithmetic number, because the mean of its divisors is an integer number (8088426).

Almost surely, 2^61021619 is an apocalyptic number.

61021619 is a deficient number, since it is larger than the sum of its proper divisors (3685789).

61021619 is a wasteful number, since it uses less digits than its factorization.

61021619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5365.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 61021619 is about 7811.6335679549. The cubic root of 61021619 is about 393.6962172615.

The spelling of 61021619 in words is "sixty-one million, twenty-one thousand, six hundred nineteen".