1551151397 has 4 divisors (see below), whose sum is σ = 1554502080. Its totient is φ = 1547800716.

The previous prime is 1551151373. The next prime is 1551151409. The reversal of 1551151397 is 7931511551.

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 1551151397 - 2⁸ = 1551151141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1551151397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551151307) 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, 1674647 + ... + 1675572.

It is an arithmetic number, because the mean of its divisors is an integer number (388625520).

Almost surely, 2^1551151397 is an apocalyptic number.

It is an amenable number.

1551151397 is a deficient number, since it is larger than the sum of its proper divisors (3350683).

1551151397 is an equidigital number, since it uses as much as digits as its factorization.

1551151397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3350682.

The product of its digits is 23625, while the sum is 38.

The square root of 1551151397 is about 39384.6594120096. The cubic root of 1551151397 is about 1157.5810166475.

The spelling of 1551151397 in words is "one billion, five hundred fifty-one million, one hundred fifty-one thousand, three hundred ninety-seven".