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2215991 is a prime number
BaseRepresentation
bin1000011101000000110111
311011120202202
420131000313
51031402431
6115255115
724556421
oct10350067
94146682
102215991
1112839a8
128aa49b
135c784b
14419811
152db8cb
hex21d037

2215991 has 2 divisors, whose sum is σ = 2215992. Its totient is φ = 2215990.

The previous prime is 2215987. The next prime is 2215999. The reversal of 2215991 is 1995122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2215991 - 22 = 2215987 is a prime.

It is a super-2 number, since 2×22159912 = 9821232224162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2215999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1107995 + 1107996.

It is an arithmetic number, because the mean of its divisors is an integer number (1107996).

22215991 is an apocalyptic number.

2215991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2215991 is an equidigital number, since it uses as much as digits as its factorization.

2215991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 29.

The square root of 2215991 is about 1488.6205023444. The cubic root of 2215991 is about 130.3735018046.

The spelling of 2215991 in words is "two million, two hundred fifteen thousand, nine hundred ninety-one".