1379157661 has 4 divisors (see below), whose sum is σ = 1576180192. Its totient is φ = 1182135132.

The previous prime is 1379157653. The next prime is 1379157673. The reversal of 1379157661 is 1667519731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1379157661 - 2³ = 1379157653 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 (1379157961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98511255 + ... + 98511268.

It is an arithmetic number, because the mean of its divisors is an integer number (394045048).

Almost surely, 2^1379157661 is an apocalyptic number.

It is an amenable number.

1379157661 is a deficient number, since it is larger than the sum of its proper divisors (197022531).

1379157661 is an equidigital number, since it uses as much as digits as its factorization.

1379157661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197022530.

The product of its digits is 238140, while the sum is 46.

The square root of 1379157661 is about 37137.0120095842. The cubic root of 1379157661 is about 1113.1097120900.

The spelling of 1379157661 in words is "one billion, three hundred seventy-nine million, one hundred fifty-seven thousand, six hundred sixty-one".