1213011958 has 16 divisors (see below), whose sum is σ = 1880893440. Its totient is φ = 586103400.

The previous prime is 1213011929. The next prime is 1213011979. The reversal of 1213011958 is 8591103121.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30973 + ... + 58183.

It is an arithmetic number, because the mean of its divisors is an integer number (117555840).

Almost surely, 2^1213011958 is an apocalyptic number.

1213011958 is a deficient number, since it is larger than the sum of its proper divisors (667881482).

1213011958 is a wasteful number, since it uses less digits than its factorization.

1213011958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27963.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 1213011958 is about 34828.3212055936. The cubic root of 1213011958 is about 1066.4856774734.

The spelling of 1213011958 in words is "one billion, two hundred thirteen million, eleven thousand, nine hundred fifty-eight".