1372215991 has 2 divisors, whose sum is σ = 1372215992. Its totient is φ = 1372215990.

The previous prime is 1372215959. The next prime is 1372216031. The reversal of 1372215991 is 1995122731.

It is an a-pointer prime, because the next prime (1372216031) can be obtained adding 1372215991 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1372215991 - 2⁵ = 1372215959 is a prime.

It is a super-2 number, since 2×1372215991² = 3765953451912224162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1372215931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686107995 + 686107996.

It is an arithmetic number, because the mean of its divisors is an integer number (686107996).

Almost surely, 2^1372215991 is an apocalyptic number.

1372215991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1372215991 is an equidigital number, since it uses as much as digits as its factorization.

1372215991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 40.

The square root of 1372215991 is about 37043.4338446100. The cubic root of 1372215991 is about 1111.2390435801.

It can be divided in two parts, 13 and 72215991, that added together give a square (72216004 = 8498²).

The spelling of 1372215991 in words is "one billion, three hundred seventy-two million, two hundred fifteen thousand, nine hundred ninety-one".