921615490 has 8 divisors (see below), whose sum is σ = 1658907900. Its totient is φ = 368646192.

The previous prime is 921615481. The next prime is 921615521. The reversal of 921615490 is 94516129.

It can be written as a sum of positive squares in 2 ways, for example, as 896223969 + 25391521 = 29937^2 + 5039^2 .

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

It is a super-2 number, since 2×921615490² = 1698750222815880200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46080765 + ... + 46080784.

Almost surely, 2^921615490 is an apocalyptic number.

921615490 is a deficient number, since it is larger than the sum of its proper divisors (737292410).

921615490 is a wasteful number, since it uses less digits than its factorization.

921615490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92161556.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 921615490 is about 30358.1206598828. The cubic root of 921615490 is about 973.1577714203.

The spelling of 921615490 in words is "nine hundred twenty-one million, six hundred fifteen thousand, four hundred ninety".