1661052631 has 8 divisors (see below), whose sum is σ = 1929466784. Its totient is φ = 1400418720.

The previous prime is 1661052623. The next prime is 1661052647. The reversal of 1661052631 is 1362501661.

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 1661052631 - 2³ = 1661052623 is a prime.

It is a super-2 number, since 2×1661052631² = 5518191685904044322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1661052593 and 1661052602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661052661) 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, 1944600 + ... + 1945453.

It is an arithmetic number, because the mean of its divisors is an integer number (241183348).

Almost surely, 2^1661052631 is an apocalyptic number.

1661052631 is a deficient number, since it is larger than the sum of its proper divisors (268414153).

1661052631 is an equidigital number, since it uses as much as digits as its factorization.

1661052631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890121.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1661052631 is about 40756.0134336027. The cubic root of 1661052631 is about 1184.2983689148.

The spelling of 1661052631 in words is "one billion, six hundred sixty-one million, fifty-two thousand, six hundred thirty-one".