1691950857 has 32 divisors (see below), whose sum is σ = 2505012480. Its totient is φ = 1010903040.

The previous prime is 1691950811. The next prime is 1691950859. The reversal of 1691950857 is 7580591961.

It is not a de Polignac number, because 1691950857 - 2¹² = 1691946761 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (1691950859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100132 + ... + 115802.

It is an arithmetic number, because the mean of its divisors is an integer number (78281640).

Almost surely, 2^1691950857 is an apocalyptic number.

1691950857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1691950857 is a deficient number, since it is larger than the sum of its proper divisors (813061623).

1691950857 is a wasteful number, since it uses less digits than its factorization.

1691950857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15793.

The product of its (nonzero) digits is 680400, while the sum is 51.

The square root of 1691950857 is about 41133.3302444623. The cubic root of 1691950857 is about 1191.5965804565.

It can be divided in two parts, 16919 and 50857, that added together give a palindrome (67776).

The spelling of 1691950857 in words is "one billion, six hundred ninety-one million, nine hundred fifty thousand, eight hundred fifty-seven".