1351637961 has 4 divisors (see below), whose sum is σ = 1802183952. Its totient is φ = 901091972.

The previous prime is 1351637951. The next prime is 1351637977. The reversal of 1351637961 is 1697361531.

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 1351637961 - 2⁵ = 1351637929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1351637951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225272991 + ... + 225272996.

It is an arithmetic number, because the mean of its divisors is an integer number (450545988).

Almost surely, 2^1351637961 is an apocalyptic number.

It is an amenable number.

1351637961 is a deficient number, since it is larger than the sum of its proper divisors (450545991).

1351637961 is an equidigital number, since it uses as much as digits as its factorization.

1351637961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450545990.

The product of its digits is 102060, while the sum is 42.

The square root of 1351637961 is about 36764.6292106965. The cubic root of 1351637961 is about 1105.6562541166.

The spelling of 1351637961 in words is "one billion, three hundred fifty-one million, six hundred thirty-seven thousand, nine hundred sixty-one".