1621312477 has 8 divisors (see below), whose sum is σ = 1652769792. Its totient is φ = 1590094800.

The previous prime is 1621312447. The next prime is 1621312489. The reversal of 1621312477 is 7742131261.

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 1621312477 - 2⁷ = 1621312349 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 (1621312447) 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, 46218 + ... + 73339.

It is an arithmetic number, because the mean of its divisors is an integer number (206596224).

Almost surely, 2^1621312477 is an apocalyptic number.

It is an amenable number.

1621312477 is a deficient number, since it is larger than the sum of its proper divisors (31457315).

1621312477 is a wasteful number, since it uses less digits than its factorization.

1621312477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119819.

The product of its digits is 14112, while the sum is 34.

The square root of 1621312477 is about 40265.5246706162. The cubic root of 1621312477 is about 1174.7773779532. Note that the first 3 decimals are identical.

The spelling of 1621312477 in words is "one billion, six hundred twenty-one million, three hundred twelve thousand, four hundred seventy-seven".