1397551 has 2 divisors, whose sum is σ = 1397552. Its totient is φ = 1397550.

The previous prime is 1397531. The next prime is 1397563. The reversal of 1397551 is 1557931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1397551 - 2¹⁹ = 873263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698775 + 698776.

It is an arithmetic number, because the mean of its divisors is an integer number (698776).

2^1397551 is an apocalyptic number.

1397551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397551 is an equidigital number, since it uses as much as digits as its factorization.

1397551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4725, while the sum is 31.

The square root of 1397551 is about 1182.1806122585. The cubic root of 1397551 is about 111.8036259162.

The spelling of 1397551 in words is "one million, three hundred ninety-seven thousand, five hundred fifty-one".