1201215091 has 2 divisors, whose sum is σ = 1201215092. Its totient is φ = 1201215090.

The previous prime is 1201215047. The next prime is 1201215109. The reversal of 1201215091 is 1905121021.

Together with next prime (1201215109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1201215091 - 2¹¹ = 1201213043 is a prime.

It is a super-2 number, since 2×1201215091² = 2885835389692276562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1201215031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600607545 + 600607546.

It is an arithmetic number, because the mean of its divisors is an integer number (600607546).

Almost surely, 2^1201215091 is an apocalyptic number.

1201215091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201215091 is an equidigital number, since it uses as much as digits as its factorization.

1201215091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 1201215091 is about 34658.5500418007. The cubic root of 1201215091 is about 1063.0171223178.

The spelling of 1201215091 in words is "one billion, two hundred one million, two hundred fifteen thousand, ninety-one".