1397194951 has 2 divisors, whose sum is σ = 1397194952. Its totient is φ = 1397194950.

The previous prime is 1397194949. The next prime is 1397194969. The reversal of 1397194951 is 1594917931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1397194951 - 2¹ = 1397194949 is a prime.

Together with 1397194949, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1397194895 and 1397194904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397194921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698597475 + 698597476.

It is an arithmetic number, because the mean of its divisors is an integer number (698597476).

Almost surely, 2^1397194951 is an apocalyptic number.

1397194951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397194951 is an equidigital number, since it uses as much as digits as its factorization.

1397194951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 306180, while the sum is 49.

The square root of 1397194951 is about 37379.0710291200. The cubic root of 1397194951 is about 1117.9413050834.

The spelling of 1397194951 in words is "one billion, three hundred ninety-seven million, one hundred ninety-four thousand, nine hundred fifty-one".